<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        /* 不太会 */
        .da {
            margin: 100px 500px;
            width: 150px;
            height: 150px;
            background-color: turquoise;
            border-radius: 50%;
            /* overflow: hidden; */
        }

        .box {
            width: 150px;
            height: 150px;
            background-color: red;
        }

        p {
            width: 150px;
            height: 150px;
            background-color: red;
            transform: rotate(-45deg);
        }

        h1 {
            width: 150px;
            height: 150px;
            background-color: red;
            transform: rotate(70deg);
            margin-top: -170px;
            ;
        }
    </style>
</head>

<body>
    <div class="da">
        <div class="box">
            <p class="p1"></p>
            <h1></h1>
        </div>
    </div>
</body>

</html>